Shimano Ultegra Shifting/Brake Lever - Left (ST-R8170-L) delivers precise, responsive shifting and braking through a refined SERVO WAVE system. It blends wireless capability with reliable wired options, offering effortless modulation and a more comfortable, ergonomic grip for extended rides. Expect smoother lever action, improved braking control, and easy maintenance with CR1632 shifter batteries that extend battery life between changes.